CN114362772A - Harmonic suppression circuit and radio frequency ATE (automatic test equipment) tester - Google Patents
Harmonic suppression circuit and radio frequency ATE (automatic test equipment) tester Download PDFInfo
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- CN114362772A CN114362772A CN202210214079.2A CN202210214079A CN114362772A CN 114362772 A CN114362772 A CN 114362772A CN 202210214079 A CN202210214079 A CN 202210214079A CN 114362772 A CN114362772 A CN 114362772A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/16—Networks for phase shifting
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- H—ELECTRICITY
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Abstract
The invention provides a harmonic suppression circuit and a radio frequency ATE (automatic test equipment), wherein the harmonic suppression circuit comprises: the harmonic suppression circuit comprises an input switch, an output switch and a plurality of parallel-connected harmonic suppression sub-circuits positioned between the input switch and the output switch, wherein each harmonic suppression sub-circuit comprises a phase adjustment module and a low-pass filter which are connected in series; the input switch conducts one corresponding harmonic suppression sub-circuit according to the input fundamental frequency signal; the phase adjusting module adjusts the phases of signals with different frequencies by adjusting the length of a radio frequency channel, so that different components in the circuit have opposite phases to the finally generated harmonic waves to offset each other; the low-pass filter suppresses the harmonic waves of different fundamental frequency signals; and the output switch conducts the corresponding harmonic suppression sub-circuit according to the fundamental frequency signal. The invention has the advantages of simple and quick realization mode, reduction of design complexity and design cost and no influence on the performance of the power amplifier and the filter by separately designing the power amplifier and the filter.
Description
Technical Field
The invention relates to the field of communication technology manufacturing, in particular to a harmonic suppression circuit and a radio frequency ATE (automatic test equipment) tester.
Background
The output signals of the radio frequency power amplifier often have rich harmonic signals, the harmonic signals need to be filtered by a low-pass filter, the output signals of the broadband radio frequency power amplifier need to be filtered by a segmented filter, and the matching effect of a circuit between the power amplifier and the filter is affected, so that the circuits of the power amplifier and the filter need to be adjusted according to different circuits.
However, adjusting the circuits of the power amplifier and the filter may affect the performance of the power amplifier, for example: power capability, gain, efficiency, etc., or adjusting the filter may affect the in-band and out-band performance of the filter, and the filter has many components, which may increase the debugging difficulty. Therefore, the design of the power amplifier and the filter needs to be designed uniformly, so that the flexibility is not provided.
Disclosure of Invention
The invention aims to provide a harmonic suppression circuit and a radio frequency ATE (automatic test equipment) tester, which are simple and quick in implementation mode and cannot influence the performance of a power amplifier and a filter.
To solve the above technical problem, the present invention provides a harmonic suppression circuit, including: an input switch, an output switch, and a plurality of parallel-connected harmonic rejection subcircuits between the input switch and the output switch, each of the harmonic rejection subcircuits including a phase adjustment module and a low pass filter connected in series; wherein the content of the first and second substances,
the input switch conducts the corresponding one of the harmonic suppression sub-circuits according to the input fundamental frequency signal;
the phase adjusting module adjusts the phases of signals with different frequencies by adjusting the length of a radio frequency channel, so that different components in the circuit have opposite phases to the finally generated harmonic waves to offset each other;
the low-pass filter suppresses the harmonic waves of different fundamental frequency signals;
and the output switch conducts the corresponding harmonic suppression sub-circuit according to the fundamental frequency signal.
Optionally, each of the harmonic suppression sub-circuits further includes an isolation switch, and the isolation switch isolates different harmonic suppression sub-circuits.
Optionally, the isolation switch is located between the phase adjusting module and the low-pass filter.
Optionally, the harmonic suppression circuit includes four of the harmonic suppression sub-circuits connected in parallel.
Optionally, the frequency bands of the low-pass filters in different harmonic rejection sub-circuits are different.
Optionally, the phase adjustment module keeps the fundamental wave signal unchanged.
Optionally, the formula for adjusting the phase by the phase adjusting module includes:
αcos（2W+θ）=A1 cos（2W+θ1）+A2 cos（2W+θ2）+……+ An cos（2W+θn）,
wherein W represents the frequency of the fundamental wave, 2W represents the second harmonic, a1, a2, … …, An represent the amplitude of the second harmonic generated in different ways, θ represents the phase of the harmonic, n represents the number of paths for generating the second harmonic, and α is the amplitude of the synthesized fundamental wave;
the phase adjustment module adjusts the phase with the goal of minimizing the absolute value of alpha.
Correspondingly, the invention also provides a radio frequency ATE tester, which comprises: the device comprises a transmitting chain, a harmonic suppression circuit and a receiving chain, wherein the harmonic suppression circuit is the harmonic suppression circuit.
Optionally, a device to be tested or a pass-through is disposed between the receiving chain and the harmonic suppression circuit.
Optionally, the step of adjusting the phase by the phase adjusting module includes:
step 1: the phase adjusting module adjusts the length of the radio frequency channel to be longer;
step 2: the receiving link monitors whether the harmonic wave becomes good;
and step 3: if yes, the phase adjusting module adjusts the length of the radio frequency channel to be continuously lengthened, and step 1 is executed;
if not, executing the step 4;
and 4, step 4: the phase adjusting module adjusts the length of the radio frequency path to be shortened;
and 5: the receiving link monitors whether the harmonic wave becomes good;
step 6: if yes, the phase adjusting module adjusts the length of the radio frequency channel to be shortened continuously, and step 4 is executed;
if not, the phase adjusting module adjusts the length of the radio frequency channel to the length in the step 4, and ends the adjustment.
In the harmonic suppression circuit and the radio frequency ATE tester provided by the invention, a plurality of harmonic suppression sub-circuits connected in parallel are arranged between an input switch and an output switch, each harmonic suppression sub-circuit comprises a phase adjusting module and a low-pass filter which are connected in series, the input switch conducts one of the corresponding harmonic suppression sub-circuits according to an input fundamental frequency signal, the phase adjusting module adjusts the phases of different frequency signals by adjusting the length of a radio frequency channel, so that different components in the circuit have opposite phases to finally generated harmonics to be mutually counteracted, the low-pass filter suppresses the harmonics of the different fundamental frequency signals, and the output switch conducts the corresponding harmonic suppression sub-circuits according to the fundamental frequency signals. The invention has the advantages that through the separated design of the power amplifier and the filter, the implementation mode is simple and quick, the design complexity and the design cost are reduced, the performances of the power amplifier and the filter are not influenced, the convenience is high in the design of the power amplifier and the filter which are not fixedly connected, and meanwhile, the high debugging performance is provided for the use occasion with the length of the radio frequency cable not fixed.
Furthermore, an isolating switch is arranged between the phase adjusting module and the low-pass filter, so that a good isolating effect between different harmonic suppression sub-circuits is realized, the problem of insufficient isolation degree of the input switch and the output switch is solved, and the overall performance of the system is improved.
Drawings
It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the invention and do not constitute any limitation to the scope of the invention.
Fig. 1 is a schematic structural diagram of a harmonic suppression circuit according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a transceiving test system according to an embodiment of the present invention.
Fig. 3 is a flow chart of the phase adjustment module adjusting the phase according to an embodiment of the present invention.
Detailed Description
To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
As used in this application, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally employed in a sense including "and/or," the terms "a" and "an" are generally employed in a sense including "at least one," the terms "at least two" are generally employed in a sense including "two or more," and the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, features defined as "first," "second," and "third" may explicitly or implicitly include one or at least two of the features unless the content clearly dictates otherwise.
Fig. 1 is a schematic structural diagram of a harmonic suppression circuit according to an embodiment of the present invention. As shown in fig. 1, the harmonic suppression circuit 10 includes: an input switch SWi, an output switch SWo, and a plurality of parallel-connected harmonic rejection sub-circuits between the input switch SWi and the output switch SWo, each of the harmonic rejection sub-circuits including a phase adjustment module and a low-pass filter connected in series; wherein the content of the first and second substances,
the input switch SWi conducts the corresponding one of the harmonic suppression sub-circuits according to the input fundamental frequency signal;
the phase adjusting module adjusts the phases of signals with different frequencies by adjusting the length of a radio frequency channel, so that different components in the circuit have opposite phases to the finally generated harmonic waves to offset each other;
the low-pass filter suppresses the harmonic waves of different fundamental frequency signals;
the output switch SWo conducts the corresponding harmonic suppression sub-circuit according to the fundamental frequency signal.
In this embodiment, each of the harmonic suppression sub-circuits further includes an isolation switch, and the isolation switch performs an isolation function on different harmonic suppression sub-circuits, so as to achieve a good isolation function between different harmonic suppression sub-circuits, so as to solve the problem of insufficient isolation between the input switch SWi and the output switch SWo, and improve the overall performance of the system.
Preferably, the isolation switch is located between the phase adjustment module and the low-pass filter. The phase adjusting module is connected with the input switch SWi, and the low-pass filter is connected with the output switch SWo.
In this embodiment, the harmonic suppression circuit includes four of the harmonic suppression sub-circuits connected in parallel. Each harmonic rejection sub-circuit includes a phase adjustment module, an isolation switch, and a low pass filter. Specifically, referring to fig. 1, the first harmonic suppression sub-circuit includes a phase adjustment module 1, an isolation switch SW1 and a low pass filter LPF1, the second harmonic suppression sub-circuit includes a phase adjustment module 2, an isolation switch SW2 and a low pass filter LPF2, the third harmonic suppression sub-circuit includes a phase adjustment module 3, an isolation switch SW3 and a low pass filter LPF3, and the fourth harmonic suppression sub-circuit includes a phase adjustment module 4, an isolation switch SW4 and a low pass filter LPF 4. The input switch SWi is connected to the phase adjusting module 1, the phase adjusting module 2, the phase adjusting module 3, and the phase adjusting module 4, and the low pass filter LPF1, the low pass filter LPF2, the low pass filter LPF3, and the low pass filter LPF4 are connected to the output switch SWo. The frequency bands of the low-pass filters in different harmonic suppression sub-circuits are different, so that the harmonic suppression function on different fundamental frequency signals is achieved. In other embodiments, the number of the harmonic suppression sub-circuits connected in parallel may be different, for example, five or six, and the specific number thereof may be determined according to actual requirements, which is not limited by the present invention.
An input signal RFin is input to the input switch SWi, the input switch SWi conducts a corresponding one of the harmonic suppression sub-circuits (for example, the first harmonic suppression sub-circuit conducts) according to an input fundamental frequency signal, and the signal enters the phase adjustment module in the corresponding harmonic suppression sub-circuit. The phase adjusting module adjusts the phases of signals with different frequencies by adjusting the length of a radio frequency channel, so that different components in the circuit have opposite phases to the finally generated harmonic waves to offset each other; different components in the circuit refer to components in all circuits (transmitting and receiving test systems) connected with the harmonic suppression circuit; the fundamental frequency signal can not be generated in the circuit, so that the fundamental wave signal can not be influenced, and the fundamental wave signal can not be changed. The phase adjusting module is connected with the isolating switch, and the isolating switch plays a role in isolating different paths (namely different harmonic suppression sub-circuits) so as to make up the problem of insufficient isolation of the input switch SWi and the output switch SWo and improve the overall performance of the system. The isolating switch is connected with the low-pass filter, the frequency bands of the low-pass filters in different harmonic suppression sub-circuits are different, the harmonic suppression function on different fundamental frequency signals is achieved, the signals passing through the low-pass filter are conducted to the corresponding harmonic suppression sub-circuits through the output switch SWo according to the fundamental frequency signals, and output signals RFout of the signals enter a next-stage circuit.
In this embodiment, the formula for adjusting the phase by the phase adjusting module includes:
αcos（2W+θ）=A1 cos（2W+θ1）+A2 cos（2W+θ2）+……+ An cos（2W+θn）,
wherein, W represents the frequency of the fundamental wave, 2W represents the second harmonic, A1, A2, … … and An represent the amplitude of the second harmonic generated in different ways, theta represents the phase of the harmonic, n represents the number of paths for generating the second harmonic, and alpha represents the amplitude of the synthesized fundamental wave;
the phase adjustment module adjusts the phase with the goal of minimizing the absolute value of alpha.
The above formula is illustrated by taking the second harmonic as an example, and the amplitude of the result equivalent to the whole second harmonic on the left of the equal sign is within a known range [ - (A)1+ A2+……+ An），+（A1+ A2+……+ An）]The value of which depends on the phase relationship of the signals to the right of the equal sign, can be changed by adjusting the phase of any of them, ideally to a value of 0, while in general, a reduction can be performed, i.e. the harmonic suppression capability is improved. Other subharmonics are similar.
The harmonic suppression circuit is arranged at the rear stage of the broadband radio frequency power amplifier to achieve the harmonic suppression effect on the broadband radio frequency power amplifier. The harmonic suppression circuit and the broadband radio frequency power amplifier are separately designed, and are connected with different harmonic suppression sub-circuits according to different power amplifiers, so that the implementation mode is simple and quick, the design complexity and the design cost are reduced, the performance of the power amplifier and the filter is not influenced, great convenience is realized in the design of non-fixedly connecting the power amplifier and the filter, and high debugging performance is provided for the use occasions with the length of radio frequency cables being not fixed.
In the prior art, a complete transceiving test system inevitably has transceiving interference, harmonic signals can be excited by the interfering fundamental wave signals, and the interfering fundamental wave signals can also directly act on a receiving link. The transmitted excitation signal enters the receiving link through the DUT & THRU (device under test & pass-through), and a harmonic signal is also excited in the receiving link. PA (power amplifier) has rich harmonic signals, and the rejection band of the filter is limited, and the high frequency signals will also generate intermodulation on the receiving link to generate harmonic signals of low frequency. The resulting harmonic suppression capability of the receive chain is therefore present on the LPF filter on the one hand, and on the other hand the vector superposition of the above harmonic signals also contributes to the overall performance, which ultimately leads to a deterioration of the harmonic suppression capability.
In view of the above problems, the present invention also provides a radio frequency ATE tester, which includes a transmitting link, a harmonic suppression circuit and a receiving link, wherein the harmonic suppression circuit is the harmonic suppression circuit described above.
Fig. 2 is a schematic structural diagram of a transceiving test system according to an embodiment of the present invention. As shown in fig. 2, the transceiver test system 100 includes a radio frequency ATE tester 20 and a DUT & THRU30 (device under test & pass-through), the radio frequency ATE tester 20 including a transmit link 21, a harmonic rejection circuit 10, and a receive link 22, the DUT & THRU30 being located between the harmonic rejection circuit 10 and the receive link 22. Wherein the transmit chain 21 further comprises a Power Amplifier (PA) and the receive chain 22 further comprises a high power Attenuator (ATT).
Fig. 3 is a flow chart of the phase adjustment module adjusting the phase according to an embodiment of the present invention. As shown in fig. 3, the step of adjusting the phase by the phase adjusting module includes:
step 1: starting to adjust, wherein the phase adjusting module adjusts the length of the radio frequency path to be longer;
step 2: the receiving link monitors whether the harmonic wave becomes good; whether a harmonic becomes good or not means whether the harmonic is suppressed or not, compared to before the length of the radio frequency path becomes long.
And step 3: if yes, the phase adjusting module adjusts the length of the radio frequency channel to be continuously lengthened, and step 1 is executed; as shown in fig. 3, if yes, go back to step 1, the phase adjustment module adjusts the length of the rf path to be longer, and then continue to step 2.
If not, executing the step 4;
and 4, step 4: the phase adjusting module adjusts the length of the radio frequency path to be shortened;
and 5: the receiving link monitors whether the harmonic wave becomes good;
step 6: if yes, the phase adjusting module adjusts the length of the radio frequency channel to be shortened continuously, and step 4 is executed;
if not, the phase adjusting module adjusts the length of the radio frequency channel to the length in the step 4, and ends the adjustment.
By adjusting the phase adjusting module in the invention, the fundamental wave phase and the harmonic phase passing through directly in the transceiving test system can be changed, and the vector sum of all harmonic signals is enabled to be 0 through debugging, or at least the vector sum of all harmonic signals can be reduced. Through actual measurement, the worst harmonic suppression capability of different phase adjustment modules is 70dBc, and the best harmonic suppression capability is 110 dBc.
In the transceiving test system 100 shown in fig. 2, first, a pass-through element THRU is provided between the output switch SWo and the receiving link 22; next, according to the steps shown in fig. 3, the phase adjusting module adjusts the phase to complete the debugging and calibration of the radio frequency ATE tester 20; finally, a device under test DUT is set between the output switch SWo and the receiving link 22, and the device under test DUT is tested.
In the radio frequency ATE test machine provided by the invention, the power amplifier and the filter are designed separately, the implementation mode is simple and quick, the design complexity and the design cost are reduced, the performance of the power amplifier and the filter is not influenced, the radio frequency ATE test machine has great convenience in the design of non-fixedly connecting the power amplifier and the filter, and simultaneously provides high debugging performance for the use occasions with the length of a radio frequency cable being not fixed.
In summary, in the harmonic suppression circuit and the radio frequency ATE tester provided by the present invention, a plurality of harmonic suppression sub-circuits connected in parallel are disposed between an input switch and an output switch, each of the harmonic suppression sub-circuits includes a phase adjustment module and a low-pass filter connected in series, the input switch conducts a corresponding one of the harmonic suppression sub-circuits according to an input fundamental frequency signal, the phase adjustment module adjusts phases of different frequency signals by adjusting a length of a radio frequency path, so that different components in the circuit have opposite phases to finally generate harmonics to cancel each other, the low-pass filter suppresses harmonics of different fundamental frequency signals, and the output switch conducts the corresponding harmonic suppression sub-circuit according to the fundamental frequency signal. The invention has the advantages that through the separated design of the power amplifier and the filter, the implementation mode is simple and quick, the design complexity and the design cost are reduced, the performances of the power amplifier and the filter are not influenced, the convenience is high in the design of the power amplifier and the filter which are not fixedly connected, and meanwhile, the high debugging performance is provided for the use occasion with the length of the radio frequency cable not fixed.
Furthermore, an isolating switch is arranged between the phase adjusting module and the low-pass filter, so that a good isolating effect between different harmonic suppression sub-circuits is realized, the problem of insufficient isolation degree of the input switch and the output switch is solved, and the overall performance of the system is improved.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (10)
1. A harmonic suppression circuit, comprising: an input switch, an output switch, and a plurality of parallel-connected harmonic rejection subcircuits between the input switch and the output switch, each of the harmonic rejection subcircuits including a phase adjustment module and a low pass filter connected in series; wherein the content of the first and second substances,
the input switch conducts the corresponding one of the harmonic suppression sub-circuits according to the input fundamental frequency signal;
the phase adjusting module adjusts the phases of signals with different frequencies by adjusting the length of a radio frequency channel, so that different components in the circuit have opposite phases to the finally generated harmonic waves to offset each other;
the low-pass filter suppresses the harmonic waves of different fundamental frequency signals;
and the output switch conducts the corresponding harmonic suppression sub-circuit according to the fundamental frequency signal.
2. The harmonic suppression circuit of claim 1, wherein each of the harmonic suppression sub-circuits further comprises an isolation switch that isolates a different one of the harmonic suppression sub-circuits.
3. The harmonic suppression circuit of claim 2, wherein the isolation switch is located between the phase adjustment module and the low pass filter.
4. The harmonic suppression circuit of claim 1, comprising four of the harmonic suppression sub-circuits connected in parallel.
5. The harmonic suppression circuit as in claim 1 wherein the frequency bands of the low pass filters in different ones of the harmonic suppression sub-circuits are different.
6. The harmonic suppression circuit of claim 1 wherein the phase adjustment module maintains a fundamental signal constant.
7. The harmonic suppression circuit of claim 1, wherein the phase adjustment module adjusts the phase by a formula comprising:
αcos（2W+θ）=A1 cos（2W+θ1）+A2 cos（2W+θ2）+……+ An cos（2W+θn）,
wherein W represents the frequency of the fundamental wave, 2W represents the second harmonic, a1, a2, … …, An represent the amplitude of the second harmonic generated in different ways, θ represents the phase of the harmonic, n represents the number of paths for generating the second harmonic, and α is the amplitude of the synthesized fundamental wave;
the phase adjustment module adjusts the phase with the goal of minimizing the absolute value of alpha.
8. A radio frequency ATE tester, comprising: the harmonic suppression circuit comprises a transmitting chain, a harmonic suppression circuit and a receiving chain, wherein the harmonic suppression circuit is the harmonic suppression circuit as claimed in any one of claims 1-7.
9. The radio frequency ATE tester of claim 8, wherein a device-to-be-tested or a pass-through is disposed between the receive chain and the harmonic rejection circuit.
10. The radio frequency ATE tester of claim 8, wherein the step of the phase adjustment module adjusting the phase comprises:
step 1: the phase adjusting module adjusts the length of the radio frequency channel to be longer;
step 2: the receiving link monitors whether the harmonic wave becomes good;
and step 3: if yes, the phase adjusting module adjusts the length of the radio frequency channel to be continuously lengthened, and step 1 is executed;
if not, executing the step 4;
and 4, step 4: the phase adjusting module adjusts the length of the radio frequency path to be shortened;
and 5: the receiving link monitors whether the harmonic wave becomes good;
step 6: if yes, the phase adjusting module adjusts the length of the radio frequency channel to be shortened continuously, and step 4 is executed;
if not, the phase adjusting module adjusts the length of the radio frequency channel to the length in the step 4, and ends the adjustment.
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| CN114826342A (en) * | 2022-06-24 | 2022-07-29 | 绍兴圆方半导体有限公司 | Radio frequency front end chip and radio frequency front end for base station |
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| Publication number | Publication date |
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| CN114362772B (en) | 2022-06-17 |
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